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引用本文:韩凤清,毛庆飞,马茹莹,张燕霞,孙宇强,韩继龙,年秀清,刘文玉,SYED Asim Hussain,马喆.腾格里沙漠盐湖氯同位素地球化学特征.湖泊科学,2018,30(4):1152-1160. DOI:10.18307/2018.0426
HAN Fengqing,MAO Qingfei,MA Ruying,ZHANG Yanxia,SUN Yuqiang,HAN Jilong,NIAN Xiuqing,LIU Wenyu,SYED Asim Hussain,MA Zhe.Chlorine isotope geochemistry of salt lakes in the Tengger Desert. J. Lake Sci.2018,30(4):1152-1160. DOI:10.18307/2018.0426
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腾格里沙漠盐湖氯同位素地球化学特征
韩凤清1,2, 毛庆飞1,2,3, 马茹莹4, 张燕霞5, 孙宇强6, 韩继龙1,2,3, 年秀清1,2,3, 刘文玉1,2,3, SYED Asim Hussain1,2,3, 马喆1,2,3
1.中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室, 西宁 810008;2.青海省盐湖地质与环境重点实验室, 西宁 810008;3.中国科学院大学, 北京 100049;4.青海省地震局, 西宁 810001;5.宁夏回族自治区地震局, 银川 750001;6.青海民族大学, 西宁 810007
摘要:
δ37Cl值可以用来指示盐湖演化过程中卤水的蒸发浓缩程度、可能的补给来源和控制因素,本文对腾格里沙漠地区12个代表性盐湖卤水样品开展了氯同位素组成研究.结果表明,研究区内沙漠盐湖卤水的δ37Cl值变化范围为-0.10‰~1.36‰,平均值为0.55‰;其中,硫酸钠亚型卤水的δ37Cl值范围为-0.10‰~1.36‰(平均值为0.56‰),硫酸镁亚型卤水的δ37Cl值范围为0.14‰~0.82‰(平均值为0.48‰).对比柴达木盆地现代盐湖分析数据,发现区内沙漠盐湖的δ37Cl平均值明显大于柴达木盆地盐湖的δ37Cl平均值,并且,硫酸钠亚型卤水δ37Cl最高,硫酸镁亚型卤水次之,氯化物型卤水最小.基于不同盐湖地下水咸化程度以及盐湖卤水中δ37Cl值与Br/Cl系数关系的研究,揭示了研究区东部和东北部盐湖可能受到第三系地层咸水的补给,而其他盐湖主要受蒸发浓缩作用影响.δ37Cl值分布特征则显示,腾格里沙漠地区部分盐湖在形成过程中可能受到区域构造活动诱发的第三系深部水补给及水-岩作用等多重因素的影响.
关键词:  氯同位素  盐湖  卤水  腾格里沙漠
DOI:10.18307/2018.0426
分类号:
基金项目:国家973前期项目(2012CB426501)和青海省应用基础研究计划项目(2014-ZJ-702)联合资助.
Chlorine isotope geochemistry of salt lakes in the Tengger Desert
HAN Fengqing1,2, MAO Qingfei1,2,3, MA Ruying4, ZHANG Yanxia5, SUN Yuqiang6, HAN Jilong1,2,3, NIAN Xiuqing1,2,3, LIU Wenyu1,2,3, SYED Asim Hussain1,2,3, MA Zhe1,2,3
1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, P. R. China;2.Key Laboratory of Salt Lake Geology and Environment of Qinghai Province, Xining 810008, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;4.Qinghai Earthquake Administration, Xining 810001, P. R. China;5.Ningxia Hui Autonomous Region Earthquake Administration, Yinchuan 750001, P. R. China;6.Qinghai Nationalities University, Xining 810007, P. R. China
Abstract:
The value of δ37Cl can be used to indicate the intensity of evaporation, possible sources and controlling factors during salt lake evolution. In this paper, 12 brine samples were collected and their chlorine isotopic compositions were analyzed. The results showed that the values of δ37Cl range from -0.10‰ to 1.36‰, with an average value of 0.55‰. The values of δ37Cl in the lakes of sodium sulfate type range from -0.10‰ to 1.36‰, with an average value of 0.56‰, and those of magnesium sulfate type are from 0.14‰ to 0.82‰, with an average value of 0.48‰. In comparison with the chlorine isotopic composition of brines in Qaidam Basin, it is found that the average value of δ37Cl in the investigated area is greater than that in the Qaidam Basin. Among three brine types, the δ37Cl values of sodium sulfate type brine are highest, those in the magnesium sulfate type brine are lower, and those in the chloride type brine are lowest. The evidences of the different salinization of groundwater, the δ37Cl values of salt lake brine and the ratios of Br/Cl indicated together that the salt lakes located in the eastern and northeastern may be supplied by saline water from the Tertiary stratum, while the other salt lakes are mainly affected by evaporation. The distribution characteristic of the δ37Cl values showed that the evolution of these salt lake brines may be affected by multiple factors such as tectonic activity-induced supplies of Tertiary deep waters and the water-rock interaction in Tengger Desert region.
Key words:  Chlorine isotope  salt lake  brine  Tengger Desert
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